Reader Beth wrote yesterday: Hey Dr. Dori, I read your post about the pup in your yard. I’m interested to know more about your take on microchipping. I’ve heard it can cause tumors but I’m not sure how founded on fact of a theory that is….. talk to me Doc! Hi Beth, Thank you for reading and for your excellent questions about whether microchips cause tumors and what I think of them. Cats are very special creatures (as I’m sure you already know) and their bodies are very sensit